Improvement in sewing-machines



' 2Sheets--Sheet1. W. G. BECKWITH. 3 Sewing-Machines.

No. 133,351. Patented N0v.26,1872.

I 2 Shefs--SheetZl Patented Nov. 26,1872.

S: uiffnrr W. G. BECKWlTH.

Sewing-Machines.

MPHOTO-LITHUGRAPH/G CU, NXKVISEORNE PROCESS) Mmmm WILLIAM G. BEOKWITH, OF NEWARK, NEW JERSEY, ASSIGNOR TO BECK- WITH SEWINGMAOHINE COMPANY, OF NEW YORK, N. Y. d v

`lv'IFROVEllENT IN SEWING-MACHINES.

Fapeciilcation forming part of Letters Patent No. 133,851, dnted November Q6, 187i?.

To all 'who-m it may concern:

Be it known that I, WiLLIAM G. BnoKwrrn, of Newark, county of Essex and State of New Jersey, have invented certain Improvements in Sewing-Machines, of which the following is a specication:

Nature and Objects of the Invent/ion.

mechanism for operating the hook, as will be fully set forth hereafter.

Description of the Drau-ting.

Figure 1 is a side elevation of the machine, showing the mechanism for imparting a reciprocatin g motion to the needle and looper. Fig. 2 is a side eleva-tion, showing the feeding device. Fig. 3 is an enlarged view of the feed device, showing the position of the needle as it ascends. Fig. 4 is a view of the same, showing the needles position when descending. Fig. 5 is a front view of the driving mechanism which operates the needle and looper. Fig. 6 shows a vertical transverse section of the same, and Fig. 7 shows an edge view of the feedin gmechanisn1.

General Description.

A is the bed of the machine; B, the clothplate; C, the clamp for fastening the machine 5 D, a hanger, affording bearings for the driving-gear. E is the needlear1n,pivoted at a. F is the presser-foot; and Gr, the tension. On the shaft b (see Figs. 5 and 6) runs a pinion, c, which is driven by the gear-Wheel d, and which carries, on one side, an eccentric, c, and on the other, a grooved cam, f. To the needle-arm E is attached the connecting-rod or pitman H. This connecting-rod, at its lower end, terminates in a ring which fits land works on the eccentric e, and thus as the pinion c is rotated an easy reciprocating motion is given to the needle-arm E. g represents the looper, which receives a reciprocating motion from the grooved cam f through the bar M, pivoted to it at h. This bar works through a slot cut in the standard I, and has attached to it a stud, j, which runs in the groove in the cam f and imparts motion to the bar; and thus it will be seen that the cam f, pinion c, and eccentric e are all connected and revolve on the shaft b. y The feeding device is constructed as follows: To the upper end of the needle-arm is pivoted a short bar, J. This bar is immovable on the screw, and can only be oscillated with it. Through the screw l and to the outside of the bar J the shank of the needle m passes, and is clamped by the thumb-screw n. Thus it will be seen that the bar J and needle m must oscilla-te together with the screw l. Perpendicularly from the rib o of the needle-arm a pin, p, projects, the object of which is to keep the spring q, which presses against the upper end ofthe barJ, in position. To the lower end of the rib o, on the needle-arm, is a thumb-screw, K, and against this screw the spring q has a tendency to keep the bar J. The cloth'is held on the plate B by a presser-foot, F, which is slightly roughened on its under surface, the reason for which will be hereinafter explained. The feeding device thus constructed will operate as follows: The thread, having been passed from the spool over the tension, is car.- ried down to and through the needle. This needle, as in myformer patent, is tangent to the arc described by the needle-arm, and thus inpassing through the cloth carries it forward the length of the difference of the radius of y the point of the needle, and that of the point at which the needle stops, or would cease to be tangent to the arc described by the-needle arm, and as the needle necessarily performs the same part of a revolution in ascending as in descending, it would return the cloth from where it withdrew it; but this is obviated in my previous patent by slightly nitching the presser-foot to prevent the return of the cloth, and the needle in ascending caused the cloth to pucker in front of it, and, as it depended on the elasticity of the cloth to remove this puckering, the stitches had a tendency to be uneven and irregular and the present invention is intended to obviate the diiculty, for as the needle commences to ascend the thread tightens, and its pull on the needle slightly turns it (the needle) along with the bar J, the

spring q readily yielding to the pull of the thread. Thus the needle is withdrawn from the cloth without puckering it, Or having any tendency to push it backward. The needle and bar J, as they are held in this position, are seen in Fig. 3. As the needle commences to returnl the thread slackens, and the spring forces the bar out and moves the point of the needle some distance over the surface of the cloth, preparatory to its descending for another stitch, as seen in Fig. 4.

The thumb-screw K' by being screwed in will throw the point of the needle in, and it will thus shorten the stitch; and by unscrewing it the point of the needle will be thrown out by the spring q and the stitch len gthened, thus rendering the regulation Of the stitch easy and accurate, and also removing all difficulty in setting the needle, as there is but one hole in which to insert it, and its position over the needle-hole in the cloth-plate can be easily adjusted by the screw K.

Claim.

The combination and arrangement of the re Witnesses:

E. H. J OHNsON, J. P. CRAWFORD. 

